Pipe-wrench.



No. 648,766. Patented May I, i900.

, R. MAcKAY.

PIPE WRENCH.

(Application led Nov. 23, 1899.) V

` (No Model.)

UNITED STATES ATENT muera RODERICK MACK/XY, 0F LOS ANGELES, VARIFORNIA.

PIPE-WRENCH.

SPECIFICATION forming part of Letters Patent No. 648,766, dated May 1, 1900.

Application filed November 23,1899. Serial No. 738,060. (No model' To (all w/bom/ t 711,/1/ 7/ concern.-

Be it known that I, RODERICK MACKAY, a citizen of the United States, with residence and post-oflice address at Los Angeles, in the county of Los Angeles and State of California, have invented certain new and useful Improvements in Iipe-Vrenches, of which the following is a full, clear, and exact description, reference being had to' the accompanying drawings, which form a part of this specification. l

My inventionrelates to an im proved wrench intended more particularly for screwing sections of pipe together or unscrewing the same, but whiehmay be used for analogous purposes, such as a nut-wrench, dac.; and my invention consists in certain features of novelty hereinafter described and claimed.

Figure 1 represents the end of a pipe, showing a side elevation of my improved wrench in position for turning the pipe or holding the same, according t-o circu instances, and which shows in dotted lilies the method for releasing the wrench from the pipe. Fig. II is a detail top view of myimproved wrench. Fig. III is a detail perspective of the chain, showing gripping-teeth in position. Fig. IV is a detailpcrspect-ive ofthe lever or handle,show ing manner of connecting the chain therewith. Fig. V is a detail perspective View showing mortise for the reception of thegripping-tooth. Fig. VI is a perspective of one ofthe gripping-teeth detached from the chain'.-

Referring to the drawings, l represents the handle or lever, which the operatorgrasps in operating the wrench.

2 represents a single link having its inner end pivoted to the inner end of the lever by means of a pin 3, there being a recess 4 formed in the end of the lever for the 'reception of the link. l

5 represents a chain which passes around the object to be/operated upon, said chain consisting of a series of double links 6 and a series of single links 7, having each of their ends pivotcd to the double links by a series of pins 8, a portion of said pins S beingpractically flush with the outside of thelinks, and a portion of the pins projecting beyond the outer face of theVV links, forming studs 9, said studs 9 being adapted to engage/lugs 10 upon the lever, there being a rgess/ll between the lugs 10, in which the links rest when the wrenchA is in position for use.

12 represents curved recesses in the lugs l O, in which the studs t) rest when the device is iu operation, there being a number of the studs in order to lengthen or shorten the chain, according to the size of the pipe being operated upon.

13 represents the pipe, around which the chain 5 is passed and secured to the lugs 10 in order to obtain a grip upon the pipe.

One feature of my invention as distinguished from other wrenches'is to form a series of bearings extending across the inner edges of the double links midway between thcirends forgripping the pipe independently of the said edges substantially throughout its entire circumference. plish this, I provide a series of removable teeth 14, preferably made of hardened steel and also preferably made in triangular shape, so as to form a series of bearing-points 15, projecting inwardly from and located centrally between the ends of the double links.

1G represents a dovetail mortise cut in the double links 6, this being made to conform to the shape of the triangular teeth 14, the edge of the tooth 15 extending beyond the faces of the double link, as shown at 17, in order to provide a grasping-point upon the pipe'lS when the wrench is placed in position. In forming the teeth 14 I provide a series of bearing edges which permit a series of bearing-faces to be presented to the pipe simply by driving the tooth out of the mortises 16 and giving it a partial rotation and then re. inserting it in said mortises.

Although I have shown my tooth made iu the form of a triangle, I do not desire to confine myself to said shape, as other contours might be used, if found desirable. By the use of a removable tooth I am enabled to construct a wrench-chain in which all the bearing-points are made of specially-hardened material, while the body of the chain may be made of an inferior quality of metal, and at the same time the operator of the wrench is provided with a tool which he can readily repair in case of breakage to the points of the teeth by simply reversing the tooth, and at the same time it obviates the withdrawing of the temper ol' the bearing 'parts in order to In order to accmnrepair the saine and again hardening the vIO wrench, as in the Wrenches now used for analogous purposes.

In Fig. I, I have shown the application of my improved wrench, showing the manner in which the chain is tightened around the pipe, with the removable gripping-teeth engaging the same at a series of points on the periphery of the pipe, and have also shown in dotted lines how the wrench may be readily loosened Afrom vthe pipe in order to take a fresh hold or removable teeth located in the lncrtises and extending across the double links, and means whereby the ends of the chain are connected with the handle.

2. A wrench comprising a handle, having lugs, and a recess at its inner end, a link pivoted in the recess of the lng, a chain connected with the link and having a series of connecting-links, a series of double links, a series of projecting pivot-pins Wthmfhich the lugs are adapted to engage, and a series of double links formed with inortises midway of thc ends thereof, and a series of angnlanreinovable teeth located in the inortises and extending across the double links.

RoDERIcK MMKAY.

Witnesses:

J. XV. KEMP, JAS. E. KNIGHT. 

